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www.fptgroup.com
HVAC
Installation & Operating Instructions
Page 15
4. Electrical Installation
4.1 Grounding the Drive
This manual is intended as a guide for proper
installation. ERIKS Industrial Services cannot
assume responsibility for the compliance or the
non-compliance to any code, national, local or
otherwise, for the proper installation of this drive or
associated equipment. A hazard of personal injury and/or
equipment damage exists if codes are ignored during
installation.
This Fenner QD drive contains high voltage
capacitors that take time to discharge after
removal of the main supply. Before working on the
drive, ensure isolation of the main supply from line
inputs. Wait ten (10) minutes for the capacitors to discharge
to safe voltage levels. Failure to observe this precaution
could result in severe bodily injury or loss of life.
Only qualified electrical personnel familiar with the
construction and operation of this equipment and
the hazards involved should install, adjust, operate,
or service this equipment. Read and understand
this manual and other applicable manuals in their entirety
before proceeding. Failure to observe this precaution could
result in severe bodily injury or loss of life.
4.1.1 Grounding Guidelines
The ground terminal of each Fenner QD:HVAC should be
individually connected DIRECTLY to the site ground bus bar
(through the filter if installed). Fenner QD ground
connections should not loop from one drive to another, or
to, or from any other equipment. Ground loop impedance
must confirm to local industrial safety regulations. To meet
UL regulations, UL approved ring crimp terminals should be
used for all ground wiring connections. The drive Safety
Ground must be connected to system ground. Ground
impedance must conform to the requirements of national
and local industrial safety regulations and/or electrical
codes. The integrity of all ground connections should be
checked periodically.
4.1.2. Protective Earth Connector
The cross sectional area of the PE Conductor must be at
least equal to that of the incoming supply conductor.
4.13 Safety Ground
This is the safety ground for the drive that is required by
code. One of these points must be connected to adjacent
building steel (girder, joist), a floor ground rod, or bus bar.
Grounding points must comply with national and local
industrial safety regulations and/or electrical codes.
4.1.4. Motor Ground
The motor ground must be connected to one of the ground
terminals on the drive.
4.1.5. Ground Fault Monitoring
As with all inverters, a leakage current to earth can exist.
The Fenner QD:HVAC is designed to produce the minimum
possible leakage current whilst complying with worldwide
standards. The level of current is affected by motor cable
length and type, the effective switching frequency, the earth
connections used and the type of RFI filter installed. If an
ELCB (Earth Leakage Circuit Breaker) is to be used, the
following conditions apply:
•
A Type B Device must be used
•
The device must be suitable for protecting equipment
with a DC component in the leakage current
•
Individual ELCBs should be used for each Fenner drive
Drives with a EMC filter have an inherently higher leakage
current to ground (Earth). For applications where tripping
occurs the EMC filter can be disconnected (on IP20 units
only) by removing the EMC screws on the side of the
product.
The Fenner QD:HVAC range has input supply voltage surge
supression components fitted to protect the drive from
voltage transients, typically originating from lightening
strikes or switching of high power equipment on the same
supply.
4.1.6. Shield Termination (Cable Screen)
The safety ground terminal provides a grounding point for
the motor cable shield. The motor cable shield connected to
this terminal (drive end) should also be connected to the
motor frame (motor end). Use a shield terminating or EMI
clamp to connect the shield to the safety ground terminal.
Internal
EMC
Filter
Internal
Surge
Protection
EMC
VAR
Earth
L/L1
N/L2
L3
